Growth, population composition and reproduction of Bream Abramis brama (L.) in Lake Volvi, Macedonia, Greece |
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| Authors: | V A Valoukas P S Economidis |
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| Institution: | Zoology Department, Aristotle University, Thessaloniki, Greece |
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| Abstract: | Abstract– Growth, population composition and reproduction of bream were studied in Lake Volvi from 1989 to 1991. Females had a higher growth in length (L∞=507 mm, k=0.094) than males (L∞=452 mm, k=0.102). Growth can be characterized as medium, due to low food sources (zooplankton and chironimids). Large specimens are scarce because of high fishing mortality and low growth rate. All males greater than three years old, longer than 135 mm and all females greater than four years old and longer than 150 mm were sexually mature. These values of age and size of first maturity are the lowest that have been reported for this species. The size of the spawning egg is independent of the body size. |
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| Keywords: | growth population composition reproduction |
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